Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd9b3a5a3955939…

MALICIOUS

PDF

96.8 KB Created: 2021-09-16 03:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1002ba90cf21aed0c08f181095f002c4 SHA-1: 6f2c3fded8165f4f3e4f9d9abaa465ff86829d47 SHA-256: 1bd9b3a5a3955939dc6ecbaff861e5a32e0e9bd1ff3780d7fb786d1356a68e5b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external URIs, many of which point to link farms hosted on potentially compromised or disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users. The presence of multiple compromised CMS upload links further suggests an attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ty-int.com/files/files/63482527958.pdf In PDF document text
    • http://eskuvoiiranytu.hu/blog/file/59571724384.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/79478231772.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210908001353134187poxfr.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/19338479960.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/16210257652.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210906135221.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306c2609743---77344796926.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/tawuxixanolakaza.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161323b0fa9fc9---dikusidipaveziduburar.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/44110505601.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/34250842622.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/vunubesijanunarelebenomo.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/gameporazo.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/19832002000.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/riwekidudipural.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64125913855.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/pumeduriwijafom.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/21973331435.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/caec9fda3d7cdc1bd18e4ff488f17ef4/baruxen.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/89887607951.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/34245500166.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/33546016044.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/02f19caded292280b17833103dc2fbcc/zafozigenebedojusazoxip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fast+and+furious+9+full+movie+on+123moviesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12670 11168 bytes
SHA-256: 73f8c4fe84dacd19b129a38cadbaad74ceab6be024cf868afa378abab09d61e1
font_02_sfnt_off000140ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AC 19812 bytes
SHA-256: 6e4bd4ca6eb2ae0e3c3bb8d7f6385f7ee066cf5301003ac4c9197ca5075c560b

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